See also recent discussions in these GitHub issues that touch on composition:

Look particularly at the issues that were created after 2018-01-31 – when 
Gilbert/Mindeavor split the proposal into four competing proposals – since 
those issues reflect the current state of the art. To see those four competing 
proposals, look at the pipeline operator’s wiki, which has a list of the four 
proposals (

In particular, Naveem, you may be interested in, which discusses 
the intersection of terse function application and terse function composition.
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